Numerical simulation of ground surface settlement of underpass building in tunnel boring machine double-line tunnels

Abstract

Ground surface settlement under subway tunnel construction is one of the main sources of urban ground surface settlement, which may threaten the safety of existing buildings. Therefore, it is necessary to study the influence of subway tunnel construction on the safety and stability of surface subsidence. In the current study, the ground settlement originating from the operation of a tunnel-boring machine (TBM) while excavating a double-line tunnel that underpasses existing buildings is studied. To this end, numerical simulations were carried out and experimental data were analyzed. The boring parameters for the underpass interval section were derived by simulating the construction process and analyzing the TBM parameters in a real project. Then, the influence of thrust force, grouting pressure, and frictional force was considered on the surface settlement. For spatial locations between the existing buildings and the tunnel in the underpass area, the width of the ground surface settlement caused by different excavation sequences of the TBM two-line tunnel was analyzed. The obtained results demonstrate that the performed calculations are consistent with the monitoring data. It is found that the width and depth of the ground surface settlement trough are affected by the distance between the existing buildings and the TBM construction tunnel. However, the settlement location is independent of the excavated sequence but depends on the location of the TBM tunnel and the existing building.

Dynamic Prediction of Longitudinal Settlement of Existing Tunnel Using ConvRes-DLinear Model with Integration of Undercrossing Construction Process Information

“…In practical situations, it is often impossible to anticipate structural deformations due to a multitude of complex factors. As a result, numerical simulations that are conducted often only occur during the design stage or post-accident review and analysis, leading to an absence of accurate models and techniques for predicting tunnel lining deformation during operation [1][2][3][4][5]. Achievement of accurate prediction of deformation in tunnel lining structure is therefore an urgent challenge that must be tackled to ensure continued safe and reliable operation of subway systems.…”

Construction stability analysis of intersection tunnel in city under CRD method

“…To prevent the engineering disaster of ground buildings collapsing, researchers have thoroughly analyzed the deformation characteristics of structures through a combination of numerical simulation, on-site measurement, and monitoring techniques (Wang et al, 2018;Ayasrah et al, 2021;Ren et al, 2022;Wang et al, 2023). Fu (2021) utilized MIDAS/GTS software to assess the impact of shield tunneling on overlying buildings.…”